Name: Polyptychodon ‭(‬Shaped fin tooth‭)‬.
Phonetic: Po-lyp-tie-ko-don.
Named By: Richard Owen‭ ‬-‭ ‬1841.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Sauropterygia,‭ ‬Plesiosauria,‭ ‬Pliosauroidea,‭ ‬Pliosauridae.
Species: P.‭ ‬interruptus‭ (‬type‭)‬,‭ ‬P.‭ ‬hudsoni.
Diet: Carnivore/Piscivore.
Size: Roughly estimated at about‭ ‬7‭ ‬meters long.
Known locations: England,‭ ‬France and the USA,‭ ‬Texas.
Time period: Albian to Turonian of the Cretaceous.
Fossil representation: Teeth with some jaw material and vertebrae.

       Polyptychodon has been considered to be a dubious genus of pliosaur by some considering that it is based upon only teeth and vertebrae.‭ ‬Despite this two species are recognised,‭ ‬The first and type species,‭ ‬being named in‭ ‬1841‭ ‬and based upon teeth and vertebrae from England and France that are Aptian in Age.‭ ‬Further pliosaur remains from the Turonian of Texas,‭ ‬were used to establish the second species,‭ ‬P.‭ ‬hudsoni.
       The vertebrae of Polyptychodon have been compared to those of other pliosaur genera such as Kronosaurus,‭ ‬which in turn have yielded rough estimates of around seven meters long for Polyptychodon.‭ ‬If correct,‭ ‬then this would mean that Polyptychodon was a mid-sized pliosaur.

Further reading
-‭ ‬Odontography.‭ ‬-‭ ‬Hippolyte Baillière,‭ ‬London,‭ ‬655‭ ‬p.‭ ‬-‭ ‬Richard Owen‭ ‬-‭ ‬1841.
-‭ ‬The first record of the plesiosaurian genus Polyptychodon‭ (‬Pliosauridae‭) ‬from the New World.‭ ‬-‭ ‬Journal of Paleontology‭ ‬37‭ (‬1‭)‬:131-133.‭ ‬-‭ ‬S.‭ ‬P.‭ ‬Welles‭ & ‬B.‭ ‬H.‭ ‬Slaughter‭ ‬-‭ ‬1963.
-‭ ‬The‭ "‬sauropod‭" ‬from the Albian of Mesnil-Saint-Père‭ (‬Aube,‭ ‬France‭)‬:‭ ‬a pliosaur,‭ ‬not a dinosaur.‭ ‬-‭ ‬Association Géologique Auboise,‭ ‬Bulletin Annuel,‭ ‬Sainte-Savine‭ ‬26:‭ ‬3-8.‭ ‬-‭ ‬E.‭ ‬Buffetaut,‭ ‬C.‭ ‬Colleté,‭ ‬B.‭ ‬Dubus,‭ ‬J.‭ ‬-L.‭ ‬Petit‭ ‬-‭ ‬2005.
- A reappraisal of Polyptychodon (Plesiosauria) from the Cretaceous of England. - PeerJ 4 - D. Madzia - 2016.


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